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GW191204_171526 | Gravitational-wave mergers | Apex Andromeda | Apex Andromeda

Black Holes/Gravitational-wave mergers/GW191204_171526

ConfirmedBinary Black Hole

GWOSC compact-binary event

GW191204_171526

Both component-mass lower bounds exceed 3 solar masses

Primary mass11.7 M☉

Secondary mass8.4 M☉

ObservedDec 4, 2019

Event identity

Classification and release

ID: gwtc:GW191204_171526
Event name: GW191204_171526
Classification: Binary Black Hole
Composition status: Confirmed
Confidence boundary: Both component-mass lower bounds exceed 3 solar masses
Catalog: GWTC-3-confident
Preferred event version: v1
Observed at: Wednesday, December 4, 2019 at 5:15:26 PM UTC UTC
GPS time: 1,259,514,944

Source-frame posterior

Component and remnant masses

Primary mass: 11.7 (-1.7, +3.3) M☉
Secondary mass: 8.4 (-1.7, +1.3) M☉
Remnant mass: 19.18 (-0.93, +1.71) M☉
Effective spin: 0.16
Network SNR: 17.4

Propagation

Distance and statistical context

Luminosity distance: 640 (-260, +200) Mpc
Redshift: 0.13
Astrophysical probability: 0.99
False-alarm rate: 0

Provenance

Official source record

GWOSC · GWTC-3-confident

GW191204_171526

Last synchronized 9/12/2026, 1:40:20 AM UTC.

JSON record GWOSC event page